Power button board
Description Spare part number
Power button board assembly 721531-001
Before removing the power button board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 36).
5. Remove the following components:
a. Service door (see
Service door on page 37)
b. Keyboard (see
Keyboard on page 49)
c. Optical drive (
Optical drive on page 41)
d. Top cover (see
Top cover on page 53)
e. Speakers (see
Speaker assembly on page 57).
Remove the power button board:
1. Position the top cover upside-down.
2. Disconnect the cable from the board (1).
3. Remove the Phillips PM2.0×3.0 screw (2) that secures the power button board to the top cover.
60 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
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